opcodes: remove unused reverseMap

src/opcode.js

@@ -1,4 +1,4 @@
-var ops = {
+module.exports = {
   // push value
   OP_0         : 0,
   OP_FALSE     : 0,
@@ -136,15 +136,3 @@ var ops = {
   OP_PUBKEY        : 254,
   OP_INVALIDOPCODE : 255
 }
-
-var reverse = []
-for (var op in ops) {
-  var code = ops[code]
-
-  reverse[code] = op
-}
-
-module.exports = {
-  map: ops,
-  reverseMap: reverse
-}

src/script.js

@@ -1,6 +1,6 @@
 var assert = require('assert')
 var crypto = require('./crypto')
-var opcodes = require('./opcode').map
+var opcodes = require('./opcode')
 
 function Script(data) {
   data = data || []